\begin{abstract}
Java offers the basic infrastructure needed to integrate computers
connected to the Internet into a seamless distributed computational
resource: 
an infrastructure for running coarse-grained parallel applications on numerous, anonymous machines. 
First, we sketch such a resource's essential technical properties.
Then, we present {\em Javelin}, an infrastructure for global computing. 
The system is based on Internet software that is interoperable, increasingly secure, and ubiquitous: 
Java-enabled Web technology.  
Ease of participation is seen as a key property for such a resource to
realize the vision of a multiprocessing environment comprising
thousands of computers. Javelin's architecture and implementation require participants
to have access to only a Java-enabled Web browser. The security
constraints implied by this, the resulting architecture, and the current
implementation are presented.  The Javelin architecture is intended to be a
substrate on which various programming models may be
implemented. Different computation servers, each corresponding to a different programming model, are supported by Javelin's architecture.
Several are presented briefly.
Experimental results are given in the form of
micro-benchmarks, a Mersenne Prime application, and a ray-tracing application that run on a heterogeneous network of several parallel machines, workstations, and PCs. \\

\noindent {\bf Keywords:}  Distributed Computing, High Performance Computing,
Java, Internet, World Wide Web.
\end{abstract}
